GRUNDFOS · VARIABLE-SPEED VERTICAL MULTISTAGE PUMP
CRE 45 — 3 in ANSI, 3600 rpm
Variable-speed vertical multistage centrifugal pump in cast iron and stainless steel with a Grundfos MLE motor and built-in frequency converter. 8 models from CRE 45-1 to CRE 45-4-2, 7 1/2 to 30 HP, 3 in ANSI flanged ports, 3600 rpm, with or without a factory pressure sensor.
101-489 ft (44-212 PSI) Max Head · 299.7-316.8 GPM Max
7 1/2-30 HP
200-240V 3Ph · 440-480V 3Ph
3 in ANSI Flanged Ports
In-Line Suction and Discharge
Grundfos MLE Motor, Built-In Drive, IE5
3600 rpm Nominal
232-435 PSI Max Operating Pressure
NSF/ANSI 61
194-397 lb Weight
Overview
The CRE 45 is the CR 45 pump end on a Grundfos MLE motor with the frequency converter built in, so the pump varies its own speed to hold a setpoint instead of running flat out against a throttled valve. The pump head and base are cast iron; all other wetted parts are stainless steel (AISI 304). Grundfos rates the CR 45 at 238 GPM nominal duty at 3600 rpm; size it from the performance table below.
- 8 models, CRE 45-1 to CRE 45-4-2, 7 1/2 to 30 HP
- Supply: 200-240V 3Ph, 440-480V 3Ph
- Every model with or without a pressure sensor; sensor range 0-145 psi, 0-232 psi, 0-362 psi by model
- 3 in ANSI flanges, 150 lb or 300 lb by model
- MLE motor: IE5 efficiency class, IP55, speed range 360 rpm to 4000 rpm, FM310 functional module; HQQE (EPDM) cartridge shaft seal
What Ships and What It Needs to Run
Included: the CRE 45 pump end and its Grundfos MLE motor with built-in frequency converter, factory-assembled as one complete pump. With-sensor versions come with a pressure sensor in the range shown for the model.
ANSI companion flanges required, ordered separately, sized 3 in to match the pump flanges.
Without-sensor versions: for constant-pressure control, add a sensor or an external control signal.
Suction and discharge piping, valves, power supply and disconnect: sized to your system and ordered separately.
Genuine Grundfos equipment, factory-new in original packaging — sold and supported by Watermain Supply, an independent industrial supplier.
Warranty: 24 months from date of installation, but not more than 30 months from date of manufacture (Grundfos limited warranty). Grundfos repairs or replaces its own product; costs of removal, installation and transportation are not covered, and products sold but not manufactured by Grundfos carry their own manufacturer’s warranty.
Specifications
| Specification |
Value |
| Nominal flow at 3600 rpm |
238 GPM (Grundfos nominal duty) |
| Shut-off head range at full speed |
101 to 489 ft (44 to 212 PSI) |
| Motor power range |
7 1/2 to 30 HP |
| Supply |
200-240V 3Ph; 440-480V 3Ph |
| Motor |
Grundfos MLE, permanent-magnet, built-in frequency converter, IE5, IP55, FM310 functional module |
| Speed |
360 rpm to 4000 rpm; 3600 rpm nominal |
| Frequency |
60 Hz supply |
| Pressure sensor |
With-sensor versions: 0-145 psi, 0-232 psi, 0-362 psi by model; without-sensor versions have none |
| Suction and discharge ports |
3 in ANSI flanged, in-line |
| Connections |
3 in ANSI flanges, 150 lb or 300 lb by model |
| Maximum operating pressure |
232 PSI; 435 PSI on CRE 45-4 (300 lb flanges) |
| Shaft seal |
HQQE (EPDM), the Grundfos standard on these pumps |
| Liquid temperature |
−22 °F to 248 °F |
| Pump orientation |
Vertical |
| Approvals |
NSF/ANSI 61 drinking water (Grundfos product data) |
Models & Performance — Will It Do What You Need?
Find the pressure you need at your flow and pick the first model that reaches it at full speed; the drive then slows the pump to hold your setpoint. Pressure at flow in PSI, one row per model and motor.
CRE 45-1 to CRE 45-4-2 · 9 curves
| Model (HP) |
0 GPM (Shut-off) |
58 GPM |
145 GPM |
217.5 GPM |
290 GPM |
| CRE 45-1 (10 HP) |
54 |
54 |
49 |
43 |
33 |
| CRE 45-1-1 (7 1/2 HP) |
44 |
44 |
41 |
35 |
23 |
| CRE 45-2 (15 HP, 200-240V) |
106 |
108 |
99 |
87 |
59 |
| CRE 45-2 (15 HP, 440-480V) |
106 |
108 |
99 |
87 |
58 |
| CRE 45-2-2 (15 HP) |
84 |
88 |
84 |
72 |
49 |
| CRE 45-3 (25 HP) |
157 |
162 |
150 |
133 |
103 |
| CRE 45-3-2 (20 HP) |
137 |
142 |
134 |
117 |
78 |
| CRE 45-4 (30 HP) |
212 |
216 |
200 |
177 |
116 |
| CRE 45-4-2 (30 HP) |
189 |
196 |
185 |
162 |
120 |
Pressure the pump develops at full speed at each flow, in PSI, rounded down (feet = PSI × 2.31). Shut-off is Grundfos’s published maximum head. Flow columns are read from the 100% speed curve on the Grundfos 60 Hz chart for each model and motor (water at 68 °F), digitized and rounded down, at 20%, 50%, 75% and 100% of 290 GPM, the last regular flow every curve in this listing reaches; the curves end at 299.7 to 316.8 GPM. Grundfos’s published duty point sits below its own curve by more than 3% of shut-off on CRE 45-2 (15 HP, 200-240V) (by up to 8 ft at the rated flow); the table follows the curve. On CRE 45-1-1 (7 1/2 HP), CRE 45-2 (15 HP, 200-240V), CRE 45-2 (15 HP, 440-480V), CRE 45-2-2 (15 HP), CRE 45-3 (25 HP), CRE 45-3-2 (20 HP), CRE 45-4 (30 HP), CRE 45-4-2 (30 HP) the curve rises above its zero-flow head at low flow (by up to 18 ft); the published shut-off is kept and the flow columns follow the curve. At reduced speed the pump runs on a lower curve; full Grundfos charts with the reduced-speed curves are in the product images.
Before You Buy — The Limits That Decide the Fit
| Check |
What decides the fit |
| Duty point |
The model’s full-speed pressure at your flow must cover the system’s total head; shut-off is the head at zero flow (on some models the curve rises slightly above it at low flow; the table shows it). |
| Working pressure |
Inlet pressure plus the pressure the pump adds must stay within the maximum operating pressure: 232 PSI; 435 PSI on CRE 45-4 (300 lb flanges). |
| Sensor |
For constant-pressure control order the with-sensor version, and pick a sensor range above your setpoint; without-sensor versions need a sensor or external control signal for that. |
| Power |
Three-phase supply at the voltage shown in the selected option; the drive is inside the motor, so no separate VFD is needed. |
| Connections |
ANSI companion flanges (3 in) ordered separately. |
| Liquid temperature |
−22 °F to 248 °F, HQQE (EPDM) shaft seal. |
Applications
Constant-pressure water supply and boosting, HVAC heating and cooling circulation, industrial water supply and transfer, process liquids, wash and clean, water treatment and irrigation (Grundfos CR range applications).
Materials of Construction
| Component |
Material |
| Pump head and base |
Cast iron |
| Other wetted parts |
Stainless steel AISI 304 |
| Shaft seal |
HQQE cartridge seal, silicon carbide faces, EPDM rubber |
